This article covers functions of PTFE in thermal insulation cladding for missile engines. Four mechanisms: Endothermic decomposition — PTFE depolymerizes at ~400°C to tetrafluoroethylene (highly endothermic, ~3,000°C combustion gas exposure), absorbing massive heat and extracting thermal energy from wall surface. Transpiration cooling and gas film insulation — decomposition gases (tetrafluoroethylene) permeate outward through micro-pores, removing surface heat; flowing gas film isolates high-temperature combustion gas from wall, reducing near-wall heat flux by >50%; gas film modifies boundary layer velocity/temperature, alleviating particle erosion.

This article covers applications of Teflon high-temperature cloth (PTFE-coated fiberglass fabric) in the aerospace field. Key application areas: Composite material manufacturing — release cloth/film in autoclave molding, isolation layers, high-temperature conveyor belts for prepreg production; Engine and high-temperature thermal protection — thermal insulation blankets, firewall cladding, flexible high-temperature connections; Electrical insulation and wire harness protection — cable wrapping in engine compartments and landing gear bays; Aircraft interiors and fire protection — fire curtains/smoke barriers meeting FST standards, thermal/acoustic insulation blanket cladding; Space and aerospace applications — multi-layer insulation (MLI) assemblies, anti-cold-weld lubrication liners for solar panel deployment mechanisms and antenna hinges, thermal control cloth.

This article analyzes how sandblasting or matt finishing treatment affects the surface structure of PTFE high-temperature cloth. Changes occur in three dimensions: Microscopic morphology transforms from smooth mirror-like to rough gully texture with sharply increased Ra/Rz values, creating 3D mechanical anchoring structures for subsequent bonding. Coating integrity faces risks: PTFE layer thinning, potential exposure of fiberglass substrate (causing loss of non-stick property, moisture penetration, and reduced mechanical strength), plus microcracks and debris generation.

This article introduces the complete basic process for impregnating fiberglass fabric with PTFE emulsion. Seven key steps: ① Pretreatment (dewaxing/desizing) at 350-400°C to remove textile sizing agents; ② Emulsion formulation with 40-55% solid content and surfactants for improved wetting; ③ Impregnation via dip-squeeze method or doctor blade coating; ④ Drying at 100-150°C to gently evaporate water and form dry PTFE film; ⑤ Sintering at 360-390°C (up to 400°C) to melt PTFE particles into continuous film; ⑥ Multi-cycle impregnation-drying-sintering repeated 2-4 times to reach target thickness and resin content (45-65%); ⑦ Post-treatment including corona treatment, edge trimming, winding and quality inspection. Core control points: complete dewaxing, full emulsion wetting, gradual drying, precise sintering temperature, and consistent coating density. Products serve high-frequency copper-clad laminates, high-temperature conveyor belts and architectural membrane materials.

This technical brief from Jiangsu Aokai analyzes how excessively low or high sintering temperatures damage PTFE high-temperature cloth. Low sintering leaves particles unmelted, causing micro-pores, weak coating-substrate bonding, rough surfaces, poor mechanical strength, and milky opaque appearance. Overheating induces PTFE thermal degradation, generating pinholes, bubbles, brittleness, yellow-to-black discoloration, and releasing toxic fumes. Both extremes destroy compactness, non-stick performance, flexibility, insulation, and dimensional stability.

Calendering – pressing PTFE-coated fabric between heated mirror rollers at 360-380°C – dramatically alters surface morphology, release properties, impermeability, and mechanical performance. It reduces roughness from Ra 0.5-1.0 μm to <0.05 μm, seals pinholes, improves wear resistance, but decreases tear strength and flexibility. Essential for release liners and electrical insulation.

As a professional manufacturer of PTFE high-temperature fabrics, Jiangsu Aokai New Materials gives you professional insights. The core purpose of fiberglass surface treatment is to build a molecular bridge between inorganic fiberglass and organic PTFE, so as to fundamentally solve their inherent inc